Natural-draft regenerator for furnace-flues.



No. 817,072. PATENTED APR. 3, 1906. F. G. KNIGHT & H. V. PEARCE.

NATURAL DRAFT REGENERATOR FOR FURNACE FLUES.

APPLIUATION FILED 001215, 1904.

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WITNESSES: [Nl ENTORS: gza/w, a g 1446/. WM A/ l4? By W%// Attorney ITED STATES PATENT orrron.

FREDERICK C. KNIGHT AND HAROLD V. PEARCE, OF DENYER, COLO- RADO; SAID KNIGHT ASSIGNOR ()F ONE-THIRD OF HIS RIGHT TO SAID PEARCE.

NATURAL-DRAFT FIEGENERATOR FOR FURNAOE-FLUES.

Patented April 3, 1906. i

To all whom it may concern.-

Beit known that we, FREDERIoKC. KNIGHT and HAROLD V. PEARoE, subjects of the King of Great Britain, residing at Denver, in the county of Denver and State of Colorado, have invented a certain new and useful Improvement in Natural-Draft Regenerators for Furnace-Flues, of which the following is a full, clear, and exact description.

Furnaces for smelting ores may be used with additional economy and efficiency by interposing a tortuous flue or series of communicating chambers between the furnaceflue and the stack. We find that good results may be accomplished in the way of saving values and maintaining eflicient draft by connecting the smoke-flue of the furnace with the lower part of the stack, shutting off or closing the stack above by an arch or other wall, continuin the flue in a tortuous form or by means of a series of communicating chambers, preferably in severalhorizontal and vertical planes, and finally causing it to enter the stack above the arch or wall, where its aseous products receive fresh heat radiated from the arch or wall and renewed ve locity and escape into and out through the stack.

In the accompanyin drawings, illustrating the invention, in the several figures of which like parts are similarly designated, Figure 1 is a top plan view with thestack in horizontal section. Fig. .2 is a vertical section taken in the plane of line A B, Fi 1. Fi 3 is a vertical section taken in the p ane of line C D, Fi 1. Fig. 4 is a vertical section taken in the plane of line E F, Fig. 1. Fig. 5 is a horizontal section taken in the plane of line G H, Fig. 2.

The flue 1 may come directly from the furnace, (not shown,) which maybe any reverberatory or other furnace for smelting ores or other purposes. 2 is the stack into which the furnace-flue enters. Above the point where the furnace-flue enters the stack the said stack is closed by means of a masonry arch or wall 3, so that the gases and other waste roducts escaping from the furnace through the flue cannot pass upward and out of the stack, but instead thesegases, &c., enter a laterally-extending horizontal flue or chamber 4, alined with the mouth of the furnace-flue on the opposite side of the stack,

and this chamber 4 opens into another horizontal chamber 5 at an angle theretoymade with a rise 6 and a vertical dip 7, the last opening into a horizontal chamber 8, having deflecting-walls 9 and 10, and this chamber has at its far end a riser-flue 11, which opens into a horizontal chamber or flue 12, which is arranged at a somewhat higher level than chambers-45 6 and opens into the stack above the arch 3.

The hot gases striking the arch will heat it sufliciently to cause is to radiate heat into the stack above it, which radiated heat commingling with the gases entering the stack above the arch from chamber 12 insures the proper furnace-draft, while the tortuous passage of these gases through the flues or chambers insures the recovery by deposition of any values contained in the gases. As already sufficiently indicated, the stratum of hot air adjacent the arch enables the gases to regain their velocity lost by passing through the tortuous chambers, or, in other words, regenerates the draft.

It has been found also that there is a considerable saving in fuel by the use of our invention.

immediate flue connections may be located within the outer wall 13 of the building and the tortuous flue outside. 1

The flue may be provided with hand-holes or manholes for ready access to it, or other means may be utilized for cleaning out the flue. Piers 14 may be suitably disposed for supporting the flue. The flues may be of malsonry or other suitable or available materia Many variations in the form and arran ement of the tortuous passage may be avaifed of within the principle of our invention, which may be broadly stated to be first passing the gases through but not into the stack, and thereby heating the stack, then conductin these gases through a tortuous passage, and returning them to the same stack within the heated zone.

What we claim is- 1. A natural-draft re enerator for furnaceflues, comprising a stadl; transversely closed hermetically near its base, and a flue for conveying away the gases and other wastes from a furnace, said flue passing through the Y i ,80 As shhwn, the furnace and stack and the.

stack below its closure and shut off from di rect communication with the outlet in said stack by said closure and entering the stack again-above said closurethrough a series of interoommunicating chambers.

27 A natural-draft regenerator for furnaceflues, comprisinga stack, a furnace-flue-opening into the stack, a permanent hermetical arch in the stack above the flue, a return-flue entering the stack above the arch and communicating with its outlet, and a series of intercommunicating chambers interposed be tween the stack and the return-flue and forming a tortuous passage for the gasesfrom the furnace. A

3. A natural-draft regenerator for furnaceflues, comprising a stack permanently and hermetically stopped near its base, a-furnaceflue entering the stack below its stopped p01" tion and serving to create and maintain a hot zone Within the stack adjacent its stopped portion, and a tortuous flue extending from the stack and communicatingwith the furnace-flue and returning and openin into the stack in the hot zone therein a ove the stopped portion.

In testimony whereof we have hereunto set our hands in the presence of two witnesses. FREDERICK C. KNIGHT. HAROLD V. PEARCE. Witnesses asto Frederick C. Knight: W. E. RIoHARDs, 'J; B. HALE. Witnesses as to Harold V. Pearce:

A. NUTTING, HERBERT D. JAMEsoN. 

